2011 Navigation & Map question

[sna77]

Looking at a 2011 x5 with navigation. My first experience with the CIC system.

Quick questions coming from someone very familiar with the Nav systems in pre-iDrive cars, but no experience with the CIC system:

1.
Do I need to update the firmware of the Nav system? If so, what is the legit way of doing so? (i.e no torrents downloads etc). Preferbly, i would buy the firmware update from the dealer and update the system myself.

2.
Map update. How do I update the maps to latest version? Googling around a little, it looks like there is a USB stick you can buy from the dealer with the latest maps. Does the firmaware need to be current before updating the maps?

That's it for now... Sure I will have more questions soon. THANK YOU!